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(Bettongia Penicillata Ogilbyi) Into Lincoln National Park

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(Bettongia Penicillata Ogilbyi) Into Lincoln National Park 1 _ Ltici rxs.srar .T,ia120^i`ViLli11SO116.!M./ Reintroduction of the Brush tailed Bettong (Bettongia penicillata ogilbyi) into Lincoln National Park Program review from September 1999 to July 2004 Sheridan Martin, Stephen Ball and Paula Peeters Reintroduction of the Brush-tailed Bettong (Beftongia penicillata ogilbyi) into Lincoln National Park Program review from September 1999 to July 2004 April 2006 Sheridan Martin', Stephen Balle and Paula Peeters3 Current addresses: 1. Department of Natural Resources, Environment and the Arts, PO Box 1120, Alice Springs NT 0871. 2. Forest Management Branch (Sustainable Resources), Department of Conservation and Land Management, PO Box 1167, Bentley Delivery Centre WA 6983. 3. Threatened Species and Ecosystems, Conservation Services Division, Environmental Protection Agency, PO Box 15155, City East QLD 4002. Cover photos: Joe Tilley holding Brush- tailed Bettong prior to release (Michael Freak), Mallee habitat near release area in Lincoln National Park (Amy Ide). Government of South Australia Department for Environment and Heritage Contents List of figures, tables and plates 2 1. Executive summary 3 2. Background 2.1 The species 4 2.2 Former distribution of the species 4 2.3 Conservation 5 3. The Lincoln National Park Translocation Proposal 6 4. Methods 4.1 The release site 8 4.2 Release site preparation 10 4.3 Source of animals for release 10 4.4 Translocation procedure 11 4.5 Monitoring 13 4.6 Threat abatement 16 4.7 Financial and human resources 17 4.8 Statistics 18 4.9 Community involvement 18 5. Results 5.1 Release site preparation 18 5.2 Translocation procedure 18 5.3 Radio telemetry 19 5.4 Survivorship 31 5.5 Trapping 33 5.6 Spotlighting and anecdotal observations 36 5.7 Rainfall 36 5.8 Effectiveness of threat abatement 36 5.9 Financial and human resources 37 5.10 Community involvement 37 6. Discussion 6.1 Has the release been successful9 38 6.2 What can we learn from this reintroduction to inform future management of bettongs in LNP and bettong reintroductions elsewhere? 39 6.3 Recommended actions for the LNP bettong program 48 7. Suggestions for future research studies 50 8 Acknowledgements 50 9. References 51 Appendix 1. Timeline of significant events in reintroduction program 54 Appendix 2 Analysis of bettong survivorship in LNP 19992002 57 Appendix 3. Summary of costs for LNP bettong program excluding contractor and staff wages 67 Appendix 4A. Staff bettong monitoring and collaring costs 69 Appendix 4B. Summary of contractor costs 79 Appendix 4C. Summary of volunteer involvement 85 1 Martin, Ball and Peeters 2006 List of Figures I.Location of the release site (Lincoln National Park) and source populations (St Peter Island and Venus Bay Conservation Park). 2.a) Map of Lincoln National Park showing the extentof the 2001 Tulka fire and trapping transect locations. b) Satellite image of Donington Peninsula. c) Habitat map of Donington Peninsula. 3.Nest site locations of radio collared bettongs. 4.Location of radio tracked bettongs on Donington Peninsula. 5.Locations of a) all known bettongs on Donington Peninsula, 1991 to 2004, and b) all bettongs captured during non - transect cage trapping. 6.Bettong captures along a transect of 40 cage -traps from February 2000 to July 2004. 7.Locations of radio - collared bettongs found dead from 1999 to 2004. 8.Bettong captures along a transect of 40 cage -traps on Donington Peninsula from February 2000 to July 2004. List of Tables 1. Summary of release events. 2.Bettong settling time compared among release events. 3.Average furthest distance moved, dispersal from release area and home range polygon area for male and female bettongs. 4.Average dispersal from release area and home range polygon area, compared among releases and for LNP recruits. 5.Causes of bettong deaths. 6.Comparison of bettong weight gain and loss between each release event. 7.Comparison of weight gain and loss between male and female bettongs. 8.Total monthly precipitation for Port Lincoln 19992004. 9. Summary rainfall statistics for Port Lincoln. List of Plates 1. Release site 1. 2.Release event four, a public event to celebrate the International Year of the Volunteer, March 2001. ArcGis* (Geog. Information System) program was used to create the bettong distribution maps. Data was sourced by DEH regional conservation and adapted by Steve Ball, contract GIS support. 2 Reintroduction of the Brush - tailed Bettong into Lincoln NP 1. Executive Summary A program to reintroduce the Brush - tailed Bettong (Bettongia penicillata ogilbyi) to Lincoln National Park (LNP), South Australia, was initiated in September 1999 as part of a regional restoration program on Lower Eyre Peninsula. This was the second attempt to reintroduce this species to a mainland location in South Australia without predator control fencing. An intensive fox baiting program began in LNP in 1997, with additional predator and rabbit control undertaken several months prior to bettong release events. A total of one hundred and thirteen bettongs were released between September 1999 and April 2001. Bettongs were sourced from Venus Bay Conservation Park (VBCP) for four of the releases, and were sourced from St. Peters Island (SPI) for one of the releases. Fifty -four bettongs were monitored by radio telemetry between September 1999 and November 2003. Five permanent trapping transects were established to monitor the spread of bettongs through the park over time. Trapping was also undertaken to check on the health of radio tracked bettongs and to adjust or replace collars. Only one of 113 bettongs did not survive relocation, and bettongs trapped after release were consistently in good condition. Signs of reproduction were frequently observed, with 85 % of females trapped between 1999 and 2004 carrying pouch young, and at least 36 locally -born bettongs recorded independent of their mothers by May 2004. Mean survivorship probability of the monitored bettongs was very high in the first twelve months, yet dropped dramatically the second year. Survivorship probability increased in the third year, but not to the high level of year one. This is consistent with observations that the population stabilised after a number of peaks in mortality followed by concentrated predator control. Cat teeth marks found on collars indicated that many deaths (48 %) may have been caused by feral cats. At the time of writing, a small breeding population of bettongs survives in Lincoln National Park and this is the only South Australian mainland population of Brush tailed Bettongs outside of predator -proof area. Nonetheless, the population in Lincoln National Park appears to be declining, and management action is needed to ensure that it does not become extinct. Ongoing cat and fox control appears to be essential to maintain the population in LNP under current habitat conditions. However, the vegetation of LNP has been highly modified since European settlement, including the alteration of fire regimes, and currently experiences high grazing pressure from kangaroos and rabbits. This is likely to have reduced the amount and quality of food resources available to bettongs, which would increase the time that bettongs spend foraging for food, and thus increases their vulnerability to predators. Therefore reduction of grazing pressure, and the use of fire to maintain suitable habitat, are also likely to be essential for the survival of bettongs in LNP, especially if effective cat control is not achievable. Additional releases may be necessary to counter low bettong densities and limited spread throughout the park and to answer some of the questions raised by this release. Analysis of radio tracking data indicates that at least 10 and ideally 20 monitored bettongs are needed to provide minimum data for analysis, and that a large sample size is more important than a high frequency of monitoring events to estimate survivorship probability. Whip -style radio collars are recommended for future monitoring programs because of problems encountered with closed loop radio tracking collars. 3 Martin, Ball and Peeters 2006 Involvement of local media and conservation volunteers in the program engaged the local community and raised awareness of the conservation objectives of the Department for Environment and Heritage (DEH). It is recommended that the active involvement of the local community remains an important part the program and any future reintroduction. 2. Background 2.1 The species Three subspecies of Bettongia penicillata have been recognised: B. penicillata - ogilbyi which inhabits the south west of Western Australia; B. penicillata penicillata, which occupied eastern and southern regions of Australia and is now considered extinct; and B. penicillata tropica, which is restricted to north east Queensland (QLD). However it is now widely accepted that the QLD population is a distinct species of Bettongia (B. tropica) and is being managed as such (Start et al. 1995). In the present report, the term `Brush tailed Bettong' or ` Bettong' refers to the Western Australian sub species B. penicillata ogilbyi. Adult Brush tailed Bettongs are typically 300 -380 mm in length with a tail of 290 -360 mm, and weigh from 11.5 kg. Males and females are similar in appearance and occupy individual home ranges, each including a nesting and feeding area. Nesting areas are territorial but feeding areas may overlap (Christensen, 1983). Breeding can be continuous, as females can give birth at 170180 days and then every 100 days for the rest of their life of 4 -6 years. Like many other macropods, the Brush- tailed Bettong exhibits embryonic diapause (Christensen,1983). In WA, Brush - tailed Bettongs are found in open forests and woodlands. Populations established in SA have revealed an ability to utilise almost all available habitats from grasslands to woodland, with a preference for refuge sites offering shrub cover. It must be noted, however, that prior to the Lincoln NP reintroduction, all but one of these populations (Venus Bay CP) have been established and maintained in the absence of feral cats and foxes (Copley, van Weenan, 1999).
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